Renewable energyRenewable energy is a source of energy that can never be exhausted.
We can obtain renewable energy from the sun (solar energy), from the water (hydropower), from the wind (windmills), from hot dry rocks, magma, hot water springs (geothermal) and even from firewood, animal manure, crop residues and waste (Biomass).

According to newly released data from Greentech Media, Inc.,venture capital investment in renewable energy reached anunprecedented level of $3.4 Billion in 2007. Investment in solar power led the VC charge with more than $1.05 Billion invested in more than 70 VC financing rounds. Also winning record amounts of renewable energy funding was investment in battery technology at $433.9 Million and in the energy efficiency/smart grid sector at $419.1 Million. Venture firms continue to invest in biofuels such as cellulosic ethanol and biodiesel, with more than $750 Million directed towards these new feedstocks and technologies.